If you are having risk reducing surgery, you may not need any other treatments, but don't forget the risk of ovarian cancer for BRCA mutation carriers.
Most women having mastectomy will also require surgery to the lymph glands in the arm pit, usually a sentinel node biopsy. If cancer is found in the lymph glands before surgery, you may need an axillary dissection.
Some women having mastectomy will be advised to have radiotherapy. This reduces the risk of any breast cancer recurring in the chest wall area but may increase the risk of problems with a prosthetic reconstruction.
Many women with breast cancer are recommended to take hormonal therapy for several years. Some women are recommended to have chemotherapy or targeted therapy for several months. This depends on the biology of your tumour and you will discuss this in detail with your medical oncologist if needed.